Frogger cocktail monitor problems

[tech_todd]

I picked up a Frogger cocktail machine for a song last weekend. This is my first cabinet restoration project, so I am looking for advice. The machine powers up and plays, but the monitor is extremely faint, thus unplayable. My first guess would be a cap kit, but could there be other possible issues? Also, I'm not sure what type of monitor is in this machine. Looks like the machine has all original parts (except for the player 1 joystick).

Also, if anyone has a link to the Frogger COCKTAIL manual, please let me know. I've found the stand-up manual.

Thanks,
Todd

[MonitorGuru]

It could be any monitor and may not be original.

Likely it is an Electrohome G07 or a Wells-Gardner K4600 series.

Take pictures of the chassis and look around the frame for model/mfg numbers (not on the tube itself though)


You may simply need to turn up the SCREEN pot on the flyback (or on the neckboard) or the drive controls on the neckboard to brighten it.

Cap kits do wonders but are not a cure all for simple dial diagnostics.  Capkits will help geometric distortion but if the screen is dark, either the controls are set way off or amplifying transistors are bad, or the tube itself is shot.

[tech_todd]

UPDATE! My buddy Darryl and I spend some time working on the Frogger cabinet this weekend and got the monitor working well enough to make it playable.  To do so, we turned up the White Gain all the way, then adjusted the Blue, Red, and Green gain up as well. Now the screen is bright enough to play, but is still having some strange problems.

There is no blue on the top part of the title screen, and the water is also not blue. However, there is some blue in the "grass" areas. Also, some of the words on the title screens are rainbow colors.

Finally, we also were able to dig some information from the monitor chassis and the main monitor board. Here goes:

We found a label that we THINK came off the chassis that reads:
CRT Type 19VJTP22/19VMAP22
54-8662-12

On the main monitor board, there was a label that read:
Eygo Company LTD.
TV chassis suitable 19"
Model 1520H-G07

Any ideas on this one? We also took some pics, but I don't have them ready to post yet.

Any idea what monitor I am dealing with?

Thanks,
Todd

[tech_todd]

The cabinet has a deguass switch, but it did not seem to do anything. I'll play around with it again. Any idea why my blue is missing from the water and title screen? I see blue colors in other areas of the game. I'll take a picture of the screen in action asap.

Thanks,
Todd

[Ken Layton]

There is no blue on the top part of the title screen, and the water is also not blue. However, there is some blue in the "grass" areas. Also, some of the words on the title screens are rainbow colors.


You have the color pots turned up too high and it sounds like the picture tube is weak & needs to be rejuvenated.

Finally, we also were able to dig some information from the monitor chassis and the main monitor board. Here goes:

We found a label that we THINK came off the chassis that reads:
CRT Type 19VJTP22/19VMAP22
54-8662-12

Those are just picture tube type numbers not a monitor model number.

On the main monitor board, there was a label that read:
Eygo Company LTD.
TV chassis suitable 19"
Model 1520H-G07


You have an Eygo/Wei-ya/Huai I Electronics retrofit board for an Electrohome G07 monitor. Eygo was the importer at the time for the Wei-ya chassis, but shortly went out of business. Alva Amusement is now the current importer for these boards. By the way, Wei-ya has changed the model 1520H to a medium resolution chassis only on current versions. The model 820H now replaces Electrohome 1520H version.

[tech_todd]

Thanks, Ken! So, can I assume that I do have a Electrohome G07 monitor?

Also, what is involved in a monitor rejuvenation?

Finally, how would you suggest I adjust the pots (white, blue, green, red) to get the optimal play out of the monitor before rejuvenation?

Thanks,
Todd

[dabone]

No, Ken said you had a Eygo monitor,

The chassis determines which monitor it is.

Someone replaced the g07 chassis in your frogger with a replacement chassis.

As for getting the best out of the tube, just experiment, but I'd just replace the tube (Or get a new monitor).

Later,
dabone

[dphirschler]

Just some additional info to help clarify some things for Todd:

The blue area Todd is referring to covers the top half of the screen in the MAME version.  It's also the area that becomes water when the game is going.  That blue area does not appear on this monitor.  We are not sure if it's supposed to be in the game, but we assumed that since it was there in MAME, then it should be there in the game.

It may not matter, but there is some burn-in from some other game(s) on the monitor.  We tried but couldn't identify the game.  There was some diamond shape in the middle of the screen (some baseball game?).

On one section of the screen, the colors faded.  Red turned to pink.  It looked like something a degaussing would correct.  The switch on the bottom of the cabinet was labeled "Degauss" (wasn't it, Todd?) but it seemed to do nothing.  It could also be because of the burn-in.

Now, there was a small molex-type connector not plugged into anything in the cabinet (near the degauss switch).  I wonder if that had been purposely disconnected.  Anybody would have been able to hit that switch.  Come to think of it, the monitor on/off switch was also accessible from the outside.

Red seemed to bleed a little towards the bottom.  Our gain adjustments on the monitor were relatively haphazard.  I am sure we can improve it.  I am not so wure we can make it look new again.

The left and right sides were cropped off a little.  We can probably adjust that by turning the pot marked "V-size".

Did I miss anything, Todd?


Darryl

[tech_todd]

No, I think that sums it up. Thanks, Darryl!

- Todd

[Ken Layton]

The monitor was a complete Electrohome G07, but at some point someone obviously replaced the main and neck Electrohome boards with the Eygo/Wei-ya conversion boards.

Sega/Gremlin used some 50 or so different monitor makes and models during the production run of Frogger (uprights and cocktail tables). They wired the cabinet for many different monitors. That manual degauss switch was wired for a Nanao/Sega MC2000 monitor and is not used for other brands.

I like to use the monitor test patterns/color bars on Street Fighter 2 game boards for setting up the colors.

[tech_todd]

Here are a few pics of my Frogger screen. In the first two you will notice the color issues in the instructions. My guess is that a manual degaussing wlil take care of this. Comments?

Thanks,
Todd

[tech_todd]

Here is another pic showing the play screen. Notice that the water is black, not blue! However, there is some blue showing on the grass. Any ideas here?

Thanks,
Todd

[dabone]

Colors are misadjusted, and you need a degaussing coil.


Later,
dabone